Driving method for reducing ghosting of electrophoretic display
a technology of electrophoretic display and driving method, which is applied in the direction of instruments, static indicating devices, etc., can solve the problems of slow response speed, serious affect of the display effect of epd, and easy ghosting of epds, so as to and reduce the ghosting of epd
Active Publication Date: 2019-09-10
SHENZHEN GUOHUA OPTOELECTRONICS +2
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Benefits of technology
The present invention provides a driving method for reducing ghosting in EPDs by improving the driving waveform without increasing the blinking of a display screen and the time of driving waveform. This is achieved by adding a stage of standing the EPD between the stage of activating particles and the stage of writing a new image, so that a new image is written after the activating state and becomes stable. The driving waveform complies with the DC balance, preventing DC residues from damaging the EPD. The technical solution also includes a method for designing the duration of standing the electrophoretic particles, providing a reference for the automatic design for the driving waveform.
Problems solved by technology
However, EPDs still have a series of disadvantages, for example, slow response speed, ghosting easily occurring when an image is refreshed, blinking during image switching and the like.
Due to these disadvantages, the display effect of EPDs is seriously affected, and the application range of EPDs is restricted in the market.
A major disadvantage shown by an EPD is caused by the poor design of the driving waveform.
These methods cause serious blinking in the display screen, thus affecting the comfort for reading.
Meanwhile, since the duration for driving the display screen to display between white state and black state is long, the response speed of EPDs is also affected.
Method used
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[0037]Referring to FIG. 1, the conventional driving waveform includes three steps: erasing an original image, activating electrophoretic particles, and writing a new image. Due to the influences from different factors such as unstable voltage, different driving performances of particles resulting from different standing times, different activities of particles resulting from different driving waveforms and the like, the final reflectivity (i.e., ghosting residues) is different when writing a same target gray level. The driving effect of the conventional driving waveform is tested by a commercial E-ink EPD, where pixels in four different original gray levels, i.e., white, light gray, dark gray and black, are written to a same target gray level under the effect of the conventional driving waveform. Since the relationship between the brightness and the reflectivity is known and expressed by L*=116(R / R0)1 / 3−16 (where R is the reflectivity of a sample, R0 is the reference standard of the...
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A driving method for reducing ghosting in an electrophoretic display is provided without prolonging driving waveform time and scintillation by improving a driving waveform design. The method comprises four steps: erasing an original image (S1); activating activity of electrophoretic particle (S2); activating electrophoretic particle (S3); and writing a new image (S4). At the electrophoretic particle activating (S3) stage, the electrophoretic particle activating is carried out for a preset duration time (tx), wherein the voltage of the driving waveform is 0V within the preset duration time (tx).
Description
FIELD OF THE INVENTION[0001]The present invention relates to a driving method for reducing ghosting in an electrophoretic display (EPD), which belongs to the field of electrophoretic displays.BACKGROUND OF THE INVENTION[0002]Recently, EPDs have aroused extensive attention and are widely applied in E-book readers and other fields due to their low power consumption, no-backlight and the paper-like display. The EPDs are manufactured by means of charged electrophoretic particles directionally, which move in a direction opposite to their charge under the action of an electric field. In addition, they have good bistable characteristics. Therefore, the EPDs consume little power during static display and have a lower radiation than conventional liquid crystal displays, and thus are one of energy-saving and environmentally-friendly display technologies. However, EPDs still have a series of disadvantages, for example, slow response speed, ghosting easily occurring when an image is refreshed, ...
Claims
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IPC IPC(8): G09G3/34
CPCG09G3/344G09G3/34G09G2320/0257G09G2320/0204G09G2310/06G09G2310/063G09G2310/065G09G2310/068
Inventor YI, ZICHUANWANG, LIZHOU, GUOFU
Owner SHENZHEN GUOHUA OPTOELECTRONICS